chatdialog.cpp Example File
network/chat/chatdialog.cpp
/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
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** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <QtGui>
#include "chatdialog.h"
ChatDialog::ChatDialog(QWidget *parent)
: QDialog(parent)
{
setupUi(this);
lineEdit->setFocusPolicy(Qt::StrongFocus);
textEdit->setFocusPolicy(Qt::NoFocus);
textEdit->setReadOnly(true);
listWidget->setFocusPolicy(Qt::NoFocus);
connect(lineEdit, SIGNAL(returnPressed()), this, SLOT(returnPressed()));
connect(&client, SIGNAL(newMessage(const QString &, const QString &)),
this, SLOT(appendMessage(const QString &, const QString &)));
connect(&client, SIGNAL(newParticipant(const QString &)),
this, SLOT(newParticipant(const QString &)));
connect(&client, SIGNAL(participantLeft(const QString &)),
this, SLOT(participantLeft(const QString &)));
myNickName = client.nickName();
newParticipant(myNickName);
tableFormat.setBorder(0);
QTimer::singleShot(10 * 1000, this, SLOT(showInformation()));
}
void ChatDialog::appendMessage(const QString &from, const QString &message)
{
if (from.isEmpty() || message.isEmpty())
return;
QTextCursor cursor(textEdit->textCursor());
cursor.movePosition(QTextCursor::End);
QTextTable *table = cursor.insertTable(1, 2, tableFormat);
table->cellAt(0, 0).firstCursorPosition().insertText("<" + from + "> ");
table->cellAt(0, 1).firstCursorPosition().insertText(message);
QScrollBar *bar = textEdit->verticalScrollBar();
bar->setValue(bar->maximum());
}
void ChatDialog::returnPressed()
{
QString text = lineEdit->text();
if (text.isEmpty())
return;
if (text.startsWith(QChar('/'))) {
QColor color = textEdit->textColor();
textEdit->setTextColor(Qt::red);
textEdit->append(tr("! Unknown command: %1")
.arg(text.left(text.indexOf(' '))));
textEdit->setTextColor(color);
} else {
client.sendMessage(text);
appendMessage(myNickName, text);
}
lineEdit->clear();
}
void ChatDialog::newParticipant(const QString &nick)
{
if (nick.isEmpty())
return;
QColor color = textEdit->textColor();
textEdit->setTextColor(Qt::gray);
textEdit->append(tr("* %1 has joined").arg(nick));
textEdit->setTextColor(color);
listWidget->addItem(nick);
}
void ChatDialog::participantLeft(const QString &nick)
{
if (nick.isEmpty())
return;
QList<QListWidgetItem *> items = listWidget->findItems(nick,
Qt::MatchExactly);
if (items.isEmpty())
return;
delete items.at(0);
QColor color = textEdit->textColor();
textEdit->setTextColor(Qt::gray);
textEdit->append(tr("* %1 has left").arg(nick));
textEdit->setTextColor(color);
}
void ChatDialog::showInformation()
{
if (listWidget->count() == 1) {
QMessageBox::information(this, tr("Chat"),
tr("Launch several instances of this "
"program on your local network and "
"start chatting!"));
}
}